How to add mesh collision to my custom 3d model?

Questions
1

I have a interior house model, I want the player can not go through objects, how to add mesh collision to my custom 3d model? I do not want to use combination of primitive colliders cuz that would be a lot of manual work.

2

Here is one of examples - https://playground.babylonjs.com/#0VHCTL#32
Docs - Camera Collisions | Babylon.js Documentation

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